// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_LIBPLATFORM_TASK_QUEUE_H_
#define V8_LIBPLATFORM_TASK_QUEUE_H_

#include <queue>

#include "include/libplatform/libplatform-export.h"
#include "src/base/macros.h"
#include "src/base/platform/mutex.h"
#include "src/base/platform/semaphore.h"
//#include "testing/gtest/include/gtest/gtest_prod.h"  // nogncheck

namespace v8 {

class Task;

namespace platform {

    class V8_PLATFORM_EXPORT TaskQueue {
    public:
        TaskQueue();
        ~TaskQueue();

        // Appends a task to the queue. The queue takes ownership of |task|.
        void Append(std::unique_ptr<Task> task);

        // Returns the next task to process. Blocks if no task is available. Returns
        // nullptr if the queue is terminated.
        std::unique_ptr<Task> GetNext();

        // Terminate the queue.
        void Terminate();

    private:
        //FRIEND_TEST(WorkerThreadTest, PostSingleTask);

        void BlockUntilQueueEmptyForTesting();

        base::Semaphore process_queue_semaphore_;
        base::Mutex lock_;
        std::queue<std::unique_ptr<Task>> task_queue_;
        bool terminated_;

        DISALLOW_COPY_AND_ASSIGN(TaskQueue);
    };

} // namespace platform
} // namespace v8

#endif // V8_LIBPLATFORM_TASK_QUEUE_H_
